Sixteen nitroso-compounds were synthesized by the nitrosation of the phenols and naphthols with the sodium nitrite. The reaction of some metal ions witn these nitroso-compounds and the detection limit of these metal ions were examined. Of these metal ions(Co²⁺, Cu²⁺, Ni²⁺, Fe2+, Fe"), cobalt and iron (II) show the very sensitive color change, and copper, nickel and iron (III) also behave sensitively. In these reagents, 2-nitroso-5-diethylaminophenol (nitroso-DEAP) is the most sen- sitive reagent for cobalt and iron (ff, ffi). By the use of this reagent, cobalt and iron ions of 0.06 pen/ can be detected. Generally, nitrosonaphthols are more sensitive than nitrosophenols. However, nitrosophenols which possess the strong electron donor groups at tbe p-position of the nitroso-group such as nitroso-DEAP are not inferior to nitrosonaphthols.

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